What is Iowa's income tax rate for self-employed workers in 2026?

A flat 3.8%. Iowa replaced its graduated brackets with a single rate, so every dollar of net profit is taxed the same at the state level.

Do any Iowa cities tax self-employment income?

No. Des Moines, Cedar Rapids and other Iowa cities levy no income tax. Some school districts add a small income surtax, which appears on your IA 1040.

When are Iowa quarterly estimated taxes due?

April 30, June 30, September 30, 2026 and January 31, 2027 — month-end dates, not the federal 15ths. Iowa requires estimates if you expect to owe $200 or more of state tax.

When is the Iowa state tax return due?

April 30, 2027 for the 2026 year — fifteen days after the federal deadline. Filing your federal return on April 15 and forgetting Iowa on April 30 is a common and costly mistake.

How much should an Iowa gig worker set aside for taxes?

About 24% to 29% of net profit covers federal income tax, the 15.3% self-employment tax and Iowa's flat 3.8% together.

Does the mileage deduction lower my Iowa tax?

Yes. Iowa starts from federal figures, so the 2026 rate of $0.70 per business mile reduces both federal and Iowa taxable income.

Iowa Self-Employed Tax Calculator

Federal income tax + 15.3% self-employment tax + Iowa's flat 3.8% state tax on 2026 1099 income.

Iowa is now one of the simplest states in the country for gig workers: a flat 3.8% on your profit, no city income tax, and a state calculation that starts from your federal numbers. The trap is the calendar, not the rate. Iowa's estimated payments and its annual return are due on the 30th — April 30, June 30, September 30 and January 31 — not the federal 15ths, and the $200 estimate threshold is low enough that even a weekend DoorDash side hustle usually requires quarterly payments.

Self-employed income & expenses

Estimate federal + SE + state tax for the 2026 tax year in one pass.

Annual 1099 income

Business miles driven

Other business expenses

Self-employed health insurance

Retirement contributions (SEP / Solo 401k)

W-2 income (if any)

Federal tax withheld

Filing status

State

Estimated total tax bill

$12,162

Refund / owed

-$12,162

Effective rate

20.3%

Detailed breakdown

Mileage deduction$5,600

Total business expenses$8,100

Net self-employment income$51,900

Self-employment tax (15.3%)$7,333

½ SE deduction (above-the-line)$3,667

Adjusted gross income$48,233

Taxable income$32,133

Federal income tax$3,608

State tax (est.)$1,221

Quarterly estimated payment$2,878

Marginal rate15.8%

Iowa city tax rates for self-employed workers (2026)

Iowa now taxes self-employment profit at a flat 3.8%, one of the simpler state layers in the country. No Iowa city levies an income tax, though some school districts add a small surtax.

Local and state tax rates for self-employed residents of major Iowa cities in 2026
City	Local rate	State rate	What gig workers should know
Des Moines	No city income tax	3.8% flat	State return only; check your school district for a possible income surtax.
Cedar Rapids	No city income tax	3.8% flat	No local income levy.
Davenport	No city income tax	3.8% flat	Quad Cities drivers working Illinois still report 1099 profit to Iowa as residents.
Sioux City	No city income tax	3.8% flat	State-only income filing.
Iowa City	No city income tax	3.8% flat	State-only income filing.

Iowa local and state filing deadlines

Q1 IA 1040ESApril 30, 2026
Iowa estimates required if you expect to owe $200 or more of state tax — a very low threshold.
Q2 IA 1040ESJune 30, 2026
Second installment; Iowa uses month-end dates, not the federal 15ths.
Q3 IA 1040ESSeptember 30, 2026
Third installment.
Q4 IA 1040ESJanuary 31, 2027
Final installment for the 2026 year.
Iowa IA 1040 returnApril 30, 2027
Resident return; Iowa's filing deadline is April 30, not April 15.
Q1 federal 1040-ESApril 15, 2026
Covers income earned January 1 – March 31.
Q2 federal 1040-ESJune 15, 2026
Covers April 1 – May 31.
Q3 federal 1040-ESSeptember 15, 2026
Covers June 1 – August 31.
Q4 federal 1040-ESJanuary 15, 2027
Covers September 1 – December 31.

Iowa's estimated-payment threshold is only $200 of state tax, so even part-time gig workers usually need to make quarterly payments.
Iowa's quarterly dates and filing deadline fall on the 30th (April 30, June 30, September 30, January 31) — different from the federal calendar, so set separate reminders.
Iowa allows a partial deduction of federal income tax in older years, but under the flat-tax system that is gone; your calculation starts from federal AGI with Iowa-specific adjustments.

See every Iowa tax form you need to file — annual, quarterly, and local →

Frequently asked questions

What is Iowa's income tax rate for self-employed workers in 2026?: A flat 3.8%. Iowa replaced its graduated brackets with a single rate, so every dollar of net profit is taxed the same at the state level.
Do any Iowa cities tax self-employment income?: No. Des Moines, Cedar Rapids and other Iowa cities levy no income tax. Some school districts add a small income surtax, which appears on your IA 1040.
When are Iowa quarterly estimated taxes due?: April 30, June 30, September 30, 2026 and January 31, 2027 — month-end dates, not the federal 15ths. Iowa requires estimates if you expect to owe $200 or more of state tax.
When is the Iowa state tax return due?: April 30, 2027 for the 2026 year — fifteen days after the federal deadline. Filing your federal return on April 15 and forgetting Iowa on April 30 is a common and costly mistake.
How much should an Iowa gig worker set aside for taxes?: About 24% to 29% of net profit covers federal income tax, the 15.3% self-employment tax and Iowa's flat 3.8% together.
Does the mileage deduction lower my Iowa tax?: Yes. Iowa starts from federal figures, so the 2026 rate of $0.70 per business mile reduces both federal and Iowa taxable income.